Malicious PDF — malware analysis report

Static analysis result for SHA-256 f498e9344e0e82b4…

MALICIOUS

PDF

68.9 KB Created: 2020-11-17 20:47:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4c5203959313cddf0c2be51a575d217a SHA-1: e625d1dd0d63348458d6bfed956e155712482b9a SHA-256: f498e9344e0e82b4b28753232e1f283904e40e75276fcf580ca615f9073fd381
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, one of which is `https://trafffi.ru/aws?utm_term=code+editor+html+template`. The presence of multiple external links and the PDF_SEO_LINK_FARM heuristic suggest the document's primary purpose is to drive traffic to these sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafffi.ru/aws?utm_term=code+editor+html+template PDF link annotation
    • https://lotagixowila.weebly.com/uploads/1/3/1/1/131164100/3117058.pdfIn PDF document text
    • https://meboguvogo.weebly.com/uploads/1/3/1/4/131437667/lixedofegom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385213/normal_5f9d5c8bbad7f.pdfIn PDF document text
    • https://vogoworelo.weebly.com/uploads/1/3/4/2/134266182/5403776.pdfIn PDF document text
    • https://nuvitofoje.weebly.com/uploads/1/3/4/6/134640236/65c0c47a5d7f.pdfIn PDF document text
    • https://riwisasivituw.weebly.com/uploads/1/3/1/0/131070703/8123918.pdfIn PDF document text
    • https://ropugobefele.weebly.com/uploads/1/3/4/4/134445072/2121227.pdfIn PDF document text
    • https://levibuzoj.weebly.com/uploads/1/3/4/4/134444272/jubixetiwoxejidakomu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370269/normal_5f88764d5602a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e13ae8b-ff02-4f5e-a372-e903df13f64b/bogaxawabowini.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e40bc994-da10-4202-aab2-aa6968ec0e94/99859076225.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiwovowus/avenger_paintball_gun_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e90dfd2-676e-4c51-92bb-ebfa65205e83/manual_tecnico_wisc_iv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/277af680-a3ec-4545-b662-d597602863fd/87141213272.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55beb1c0-0ae0-4229-8e1d-1ec11c5a300f/lowudokor.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/20851665449.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FA 4928 bytes
SHA-256: 78b3172b98e52953b2ce97332a5d07ec9a720caa76f27da5e16acfe110fc07ff
font_01_sfnt_off0000e382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE382 10456 bytes
SHA-256: bcd9e5434b6b5465c5f0a5b381224c32dc42274edadf5e6965307b556b0c6f91

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